CN107388579B

CN107388579B - Hot air gun

Info

Publication number: CN107388579B
Application number: CN201710718508.9A
Authority: CN
Inventors: 韩挺; 杨伟明
Original assignee: Zhejiang Prade Electric Co ltd
Current assignee: Zhejiang Prade Electric Co ltd
Priority date: 2017-08-21
Filing date: 2017-08-21
Publication date: 2023-04-18
Anticipated expiration: 2037-08-21
Also published as: CN107388579A

Abstract

The invention discloses a hot air gun, which belongs to the technical field of mechanical heating equipment and comprises a shell, a main control panel and a hot air device, wherein the hot air device comprises a heating component, a fan and a motor; the temperature detection device comprises a detection circuit board and an infrared detection head, and a detection channel for the infrared detection head to receive external infrared radiation energy is arranged on the heating component; the heating indicating device comprises a control substrate and an indicating lamp. The invention can keep a proper distance between the hot air gun and the heated object through the actions of the temperature detection device and the heating indicating device, thereby enabling the heated object to be in a proper heated state, avoiding the potential safety hazard existing in the situation that the heated object is melted or fired due to the fact that the heating temperature is unknown or uncontrollable, ensuring the heating effect and simultaneously improving the use safety.

Description

Hot air gun

Technical Field

The invention relates to the technical field of mechanical heating equipment, in particular to a hot air gun.

Background

The hot air gun is a heating tool for heating air to form hot air flow, and has multiple use functions, specifically, the hot air gun can be used for removing old paint on the surface of metal, removing self-adhesive stickers, heating plastic rubber tubes to bend, drying damp wood, heating to thermally shrink packaging films and packaging tubes, removing rust, heating to shrink polyethylene materials for connecting metal, heating to soften welding materials, and the like, and can also be used for welding or removing elements by utilizing hot air flow blown out by a gun core of a heating resistance wire.

The existing hot air gun is generally provided with a temperature display for displaying the hot air temperature of air flow blown out by the hot air gun, so that a user can know the working condition of the hot air gun conveniently. However, the temperature display on the conventional heat gun cannot effectively reflect the temperature of the heated object. When the distance between the heat gun and the object to be heated is large, the temperature of the object to be heated is low, the heating effect is poor, and the efficiency is low. When the distance between the heat gun and the object to be heated is small, the temperature of the object to be heated is high, which may cause the object to be heated to melt, cause a fire or other physical/chemical changes, and the operational safety is low.

In addition, the existing hot air gun generally adopts a linear gear shifting structure or a key-type gear shifting structure, when the wind power gears are more, the linear gear shifting structure is long in moving stroke, the preassembly range required by the key-type gear shifting structure is large, the whole hot air gun is not compact enough, the size is increased to some extent, and the operation and the use are inconvenient.

Moreover, generally realize fixed connection through the screw between the part in the current hot-blast rifle, the equipment consumptive material is many, and need be with the help of other instruments during the equipment, and the equipment is inconvenient, and production efficiency is low, can not be fine satisfy the production demand of modernization. In addition, when the components are fixedly connected through the screws, the defects that the screws are not screwed or the screws are not completely screwed exist, so that the components are not reliably fixed, and the normal use of the hot air gun is influenced.

Disclosure of Invention

In order to solve the disadvantages and shortcomings of the prior art, the present invention provides a heat gun which can prompt the user to pay attention to the operation according to the temperature of the heated object and has firm connection among the parts in the machine body.

In order to achieve the technical purpose, the hot air gun provided by the invention comprises a shell, wherein a main control board and a hot air device are arranged in the shell, the hot air device comprises a heating component, a fan and a motor for driving the fan to rotate, a hot air pipe for discharging hot air is arranged at the front end of the shell, the heating component is arranged in the hot air pipe, the heating component and the motor are both electrically connected with the main control board, and a temperature detection device and a heating indicating device are also arranged in the shell; the temperature detection device comprises a detection circuit board electrically connected with the main control board and an infrared detection head arranged on the detection circuit board, and a detection channel for the infrared detection head to receive external infrared radiation energy is arranged on the heating component; the heating indicating device comprises a control substrate and an indicating lamp, wherein the control substrate is electrically connected with the main control panel, and the indicating lamp is arranged on the control substrate.

Preferably, the pilot lamp is equipped with a plurality ofly, and a plurality of pilot lamps set up along control substrate's length direction uniform spacing, are equipped with a plurality ofly on the shell and the jack that the pilot lamp matches.

Preferably, a capacitor is arranged on the main control board.

Preferably, the heating assembly comprises a hollow support and a heating wire wound on the support, an insulating and heat-insulating communicating pipe is arranged in the support, the detection channel is arranged on the communicating pipe, and the infrared detection head is located in an axial projection plane of the detection channel.

Preferably, the detection circuit board is provided with a laser head for positioning the detection position of the temperature detection device, and the laser head is positioned in the axial projection plane of the detection channel.

Preferably, the main control panel is provided with a control module for controlling the motor, the control module is provided with a knob post, a knob connected to the knob post is rotatably arranged in the shell, and the knob is driven to move on the control module when rotating to adjust the rotating speed of the motor.

Preferably, the control module is provided with a sliding block, the sliding block is provided with a slot hole for inserting the button post, and the knob is connected with the sliding block.

Preferably, the slider is equipped with the projection in one side of control module dorsad, is equipped with the transmission hole that supplies the projection to insert on the knob, and the knob passes through the cooperation of transmission hole and projection to be connected in the slider.

Preferably, the hot air device further comprises an inner support used for connecting the fan to the motor and an outer support arranged outside the inner support, the outer support is arranged behind the hot air pipe, a positioning ring used for connection is arranged between the outer support and the hot air pipe, a plurality of buckles are evenly arranged at the front end of the positioning ring along the circumferential direction, a positioning ring is arranged at the rear end of the hot air pipe, clamping holes matched with the buckles are evenly arranged at the positioning ring along the circumferential direction, and the rear end of the hot air pipe is connected to the positioning ring through the matching of the clamping holes and the buckles.

Preferably, a plurality of clamping blocks are arranged on the outer wall of the inner support, clamping grooves matched with the clamping blocks are formed in the rear end portion of the outer support, and the rear end of the outer support is connected to the inner support through the matching of the clamping grooves and the clamping blocks; the outer wall of the outer support is provided with a clamping protrusion, the inner wall of the shell is provided with a clamping groove matched with the clamping protrusion, and the outer support is connected to the shell through the matching of the clamping protrusion and the clamping groove.

After adopting the technical scheme, the hot air gun provided by the invention has the following advantages:

1. according to the hot air gun provided by the invention, the temperature detection device and the heating indicating device are additionally arranged in the shell, the temperature of a heated object can be accurately measured through the infrared detection head, the detected temperature is transmitted to the main control board by the detection circuit board, the measured temperature is compared with the preset value by the main control board, and when the measured temperature is higher than or lower than the preset value, the main control board controls the indicating state of the indicating lamp through the control substrate to remind a user of paying attention to the operation. Thus, the proper distance between the hot air gun and the heated object can be kept, so that the heated object is in a proper heated state, the potential safety hazard caused by the fact that the heated object is melted or ignited due to the fact that the heating temperature is unknown or uncontrollable is avoided, the heating effect is ensured, and the use safety is improved. The heating indicating device reminds the user of paying attention to the operation through the indicating lamp, the indication is obvious, and the user is effectively reminded of paying attention to the heating indicating device conveniently.

2. The pilot lamp sets up a plurality ofly, and a plurality of pilot lamps set up along control substrate's length direction evenly spaced. When the measured temperature of the heated object is higher than a preset value, the indicator lamps are sequentially lightened from the front to the back, and the user is indicated to be far away from the heated object. When the measured temperature of the heated object is lower than the preset value, the indicator lamps are sequentially lightened from back to front to indicate that the user approaches the heated object. Therefore, the indication effect of the heating indication device on the user in the working process can be further improved, and the accurate operation of the user is facilitated.

3. The main control board is provided with a capacitor, and after the power supply is cut off, the capacitor can supply power to the main control board and the heating indicating device for a short time. When the air heater just cut off the power supply, heating element's residual temperature is higher, and when heating element's residual temperature exceeded certain limit, the main control board order pilot lamp jumped the sudden strain of a muscle and reminds the user to notice, avoided the user to be burnt or place the potential safety hazard that the hot-blast rifle exists at will by heating element's residual temperature, further improved the safety in utilization.

4. Insulating and heat-insulating communicating pipes are arranged in the support of the heating assembly, and the detection channel is arranged on the communicating pipes. Under the isolation effect of communicating pipe, heating element's heat can not transmit to the detection passageway in through communicating pipe, avoids heating element's heat to cause the influence to infrared detection head's detection, guarantees the accuracy that temperature-detecting device detected the object temperature that is heated. Because communicating pipe is insulating, effectively avoid the heater because of contacting the condition that leads to appearing the electric leakage in the course of the work in communicating pipe, improve hot-blast rifle's safety in utilization. The infrared detection head is positioned in the axial projection plane of the detection channel, and the infrared radiation energy of the heated object can be directly and fully received by the infrared detection head after passing through the detection channel, so that the accuracy of the temperature detection device for detecting the temperature of the heated object is further ensured.

5. The detection circuit board is provided with the laser head, the laser head is located in the axial projection face of the detection channel, the specific position of the heated object can be accurately positioned and detected through the laser head, the accuracy of the temperature detection device during detection is further guaranteed, and therefore the heating effect of the hot air gun on the heated object is better guaranteed.

6. The main control panel is provided with a control module for controlling the motor, the control module is provided with a button column, and a knob connected with the button column is rotationally arranged in the shell. When the knob rotates, the knob post is driven to move on the control module, and the rotating speed of the motor is adjusted, so that the aim of adjusting the speed of the discharged hot air is fulfilled. The purpose of shifting is achieved by adopting a rotating mode to replace a linear mode and a key mode, the required occupied installation space and operation space are smaller, the overall structure of the hot air gun can be more compact, and the machine body is convenient to hold and use.

7. The control module is provided with a sliding block, the button post is inserted into the slot hole, and the knob is connected with the sliding block, so that the purpose of connecting with the button post is realized. When the knob is rotated, the slider drives the knob post to move on the control module, so that the purpose of gear shifting is achieved. Through the action of the sliding block, the linear motion required by the knob post during adjustment is converted into the rotation of the knob, so that the whole structure of the gear shifting mechanism is compact and convenient to adjust.

8. The knob drives the sliding block to move back and forth on the control module through the matching of the transmission hole and the convex column, and the knob and the sliding block are simple and compact in transmission matching structure, effective in transmission and compact in internal structure of the whole machine.

9. The outer support and the hot air pipe are connected through the positioning ring, and the positioning ring is connected with the rear end part of the hot air pipe through the matching of the buckle and the clamping hole. The connecting structure between the positioning ring and the hot air pipe is simple, the axial positioning and the circumferential positioning of the hot air pipe can be realized simultaneously, the connection between the positioning ring and the hot air pipe is firm after the hot air pipe is assembled, and the hot air pipe is not easy to fall off. In addition, auxiliary tools are not needed to be used when the hot air pipe and the positioning ring are assembled, connection can be achieved only through inserting and rotating, assembling efficiency is high, and disassembly and assembly are convenient during maintenance.

10. The outer support and the inner support are connected through the matching of the clamping grooves and the clamping blocks, the outer support and the outer shell are connected through the matching of the clamping protrusions and the clamping grooves, the connection structure between the components is simple, the connection strength can well meet the installation requirement, the disassembly and the assembly are convenient, and auxiliary tools are not needed to be borrowed during the disassembly and the assembly.

Drawings

FIG. 1 is a schematic view of an internal structure of a heat gun according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a top case and a hot air device of a hot air gun according to an embodiment of the present invention;

FIG. 3 is a perspective view of a top housing of a heat gun according to an embodiment of the present invention;

FIG. 4 is a perspective view of a heat indicating device in a heat gun according to an embodiment of the present invention;

FIG. 5 is a schematic view of a main control board of a heat gun according to an embodiment of the present invention;

FIG. 6 is a perspective view of a knob of a heat gun according to an embodiment of the present invention;

FIG. 7 is a side view of a knob in a heat gun according to an embodiment of the present invention;

FIG. 8 is a partial schematic view of the interior of the housing of a heat gun according to one embodiment of the present invention;

FIG. 9 is an exploded view of a hot air device in a heat gun according to an embodiment of the present invention.

In the figure, 1-shell, 11-left shell, 12-right shell, 13-top shell, 131-jack, 132-positioning rib, 133-fixing column, 134-fixing hole, 135-positioning projection, 136-mounting hole, 137-key hole, 138-through groove, 139-lug, 139 a-clamping groove, 14-handle shell, 15-main switch, 16-clamping shell, 17-groove, 18-hot air pipe, 19-machine head sleeve, 2-main control panel, 21-control module, 22-button column, 23-sliding groove, 24-contact, 25-temperature display screen, 3-hot air device, 31-fan, 32-motor, 33-inner support, 331-sleeve, 332-clamping block, 34-outer support, 341-clamping groove, 342-clamping protrusion, 343-concave hole, 344-positioning column, 35-positioning ring, 351-connecting convex column, 352-positioning hole, 353-buckle, 354-limiting groove, 36-heating component, 361-bracket, 362-limiting rib, 37-communicating pipe, 38-detection channel, 4-temperature detection device, 41-detection circuit board, 42-infrared detection head, 5-heating indication device, 51-control substrate, 52-indication lamp, 53-limiting hole, 54-fixing plate, 55-through hole, 56-positioning groove, 6-knob, 61-transmission hole, 62-knob main body, 63-Niu Gaiban, 64-shifting block, 65-pasting plate and 66-gear mark, 67-caulking groove, 68-connecting column, 69-annular groove, 7-sliding block, 71-slotted hole, 72-raised line, 73-raised line, 74-convex column, 81-key, 82-housing and 83-limiting hole.

Detailed Description

The invention is further described with reference to the following figures and specific examples. It is to be understood that the following terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," "bottom," and the like are used merely to indicate an orientation or positional relationship relative to one another as illustrated in the drawings, merely to facilitate describing and simplifying the invention, and are not intended to indicate or imply that the device/component so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore are not to be considered limiting of the invention.

Example one

As shown in fig. 1 to 9, a heat gun according to a first embodiment of the present invention includes a housing 1, and a main control board 2, a hot air device 3, a temperature detecting device 4, a heating indicating device 5, and a knob 6 are disposed in the housing. The shell 1 comprises a left shell body 11, a right shell body 12 and a top shell body 13 which are fixed together, the lower portion of the left shell body and the lower portion of the right shell body are respectively provided with an integrally formed handle shell body 14, the handle shell bodies on two sides are combined to form a handle, the handle is provided with a main switch 15 used for switching on or off a power supply, and the left shell body and the right shell body are provided with air inlet holes. The upper portion of left casing, the upper portion of right casing and the combination of top casing form one and hold the chamber, and main control board 2, hot air device 3, temperature-detecting device 4, heating indicating device 5 and knob 6 are all installed in this and are held the intracavity, and hot air device 3 includes heating element 36, fan 31 and is used for driving fan pivoted motor 32.

As shown in fig. 2, 3 and 4, the heating indicator 5 includes a control board 51 electrically connected to the main control board 2, and a plurality of indicator lamps 52 provided on the control board and arranged at regular intervals along the longitudinal direction of the control board. In this embodiment, the longitudinal direction of the control board 51 coincides with the air discharge direction of the heat gun.

The front end of the top housing 13 is provided with a plurality of jacks 131 matched with the indicator lights 52, and the jacks correspond to the indicator lights one by one. The inner wall of the top shell is provided with a positioning rib 132 positioned between adjacent jacks, and the control substrate 51 is provided with a limiting hole 53 for the positioning rib to pass through and be arranged between adjacent indicator lights 52.

The heating indicating device 5 further includes a fixing plate 54 for fixing the control substrate 51 in the accommodating chamber, and the fixing plate is fixed in the accommodating chamber by screws. Specifically, the fixing plate 54 is provided with a through hole 55 through which a screw passes, the inner wall of the front end of the housing is provided with a fixing post 133, and the fixing post is provided with a fixing hole 134 matched with the screw. The screws are screwed into the fixing holes 134 of the top case 13 after passing through the through holes 55 of the fixing plate 54, the control board 51 is located between the fixing plate and the housing, and the indicator 52 is inserted into the insertion hole 131. The fixed plate passes through screw fixed connection in top shell, and connection structure between fixed plate and the shell is simple and joint strength is high, and the installation requirement of satisfying heating indicating device that can be fine also is convenient for dismouting, change heating indicating device.

In order to realize the positioning between the top case 13 and the fixing plate 54, the fixing plate 54 is provided with positioning grooves 56 in the circumferential direction, and the inner wall of the top case is provided with positioning protrusions 135 matched with the positioning grooves. The positioning between the fixed plate and the top shell is realized through the matching of the positioning groove and the positioning bulge, the positioning structure is simple, and the mounting efficiency and the mounting precision are convenient to improve.

As shown in fig. 5, the motor 32 is electrically connected to the main control board 2, a control module 21 for controlling the motor is disposed on the rear side of the main control board, and a protruding button 22 is disposed at the bottom of the control module for adjusting the rotation speed of the motor. The knob 6 is connected to the knob post 22, and when the knob is rotated, the knob drives the knob post to move on the control module, so that the rotating speed of the motor is adjusted, and the purpose of adjusting the hot air speed is achieved. The purpose of shifting the motor is achieved by adopting a rotating mode, the occupied installation space and the occupied operation space are smaller, and the integral structure of the hot air gun can be more compact.

The control module 21 is provided with a slide block 7, the slide block is provided with a slot hole 71 for inserting the button post 22, and the knob 6 is connected with the slide block, thereby realizing the purpose of connecting with the button post. When the knob rotates, the slider drives the button post to move on the control module, so that the purpose of shifting is achieved, linear motion required by the button post during adjustment is converted into rotation of the knob, and the whole structure of the shifting mechanism is compact and convenient to adjust.

The control module 21 is provided with a long-strip-shaped sliding groove 23, the sliding block is provided with a convex strip 72 matched with the sliding groove and a convex rib 73 used for limiting, and the sliding block is arranged on the control module 21 in a limiting sliding mode through the matching of the convex strip and the sliding groove and the action of the convex rib. Specifically, in the present embodiment, the slider 7 is L-shaped, and includes a transverse portion and a vertical portion perpendicular to each other, the slot 71 is disposed on the transverse portion, the protruding strip 72 is disposed on the inner wall of the top end of the vertical portion, and the protruding strip 73 is disposed on the inner wall of the front end of the transverse portion.

In order to realize the transmission connection between the knob 6 and the slider 7, the outer wall of the vertical part of the slider is provided with a convex column 74 which protrudes outwards from the control module 21, the knob is provided with a transmission hole 61 matched with the convex column, and the knob is connected with the slider through the matching of the transmission hole and the convex column. The knob drives the sliding block to move back and forth on the control module through the matching of the transmission hole and the convex column, the structure of the transmission matching between the knob and the sliding block is simple and compact, the transmission is effective, and the internal structure of the hot air gun can be more compact.

As shown in fig. 6 and 7, the knob 6 includes a fan-shaped knob plate body 62 and Niu Gaiban disposed on the arc-shaped edge of the knob plate body, the knob cover plate is perpendicular to the knob plate body, the transmission hole 61 is disposed on the knob plate body, and a protruding dial block 64 is disposed on the outer wall of the knob cover plate.

A flitch 65 for displaying gears is fixed on the inner wall of the button cover plate 63, gear marks 66 are arranged on the outer wall of the flitch, and caulking grooves 67 matched with the gear marks are arranged on Niu Gaiban. The pasting plate 65 is fixed on the inner wall of the button cover plate 63, and the gear mark 66 is embedded in the embedding groove 67, so that a user can know the working gear of the motor conveniently, and meanwhile, the reasonable adjustment can be prompted when the motor is used by the user. Further, a marker light electrically connected to the main control board may be provided in the gear mark. When the knob 6 drives the knob post 22 to move to a certain gear, the indicator light in the gear mark corresponding to the gear is turned on, so that a user can know the working gear of the motor more clearly.

A connecting column 68 protruding away from the control module 21 is arranged at the center of the button plate main body 62, and a ring-shaped groove 69 is formed in the circumferential direction of the connecting column. As shown in fig. 8, the inner walls of the rear end portions of the left casing 11 and the right casing 12 are both provided with hollow clamping shells 16, and the edges of the clamping shells on one side parallel to the inner wall of the rear end portion of the left casing or the right casing are provided with semicircular grooves 17. After the left shell and the right shell are fixed together, the clamping shells 16 on two sides are combined to form a clamping part, and the two semicircular grooves 17 are combined to form a mounting hole for inserting the connecting column 68. The knob is rotatably arranged in the shell through the matching of the connecting column and the mounting hole, the connecting structure between the knob and the shell is simple, the stability is good, and the internal structure of the whole machine is more compact. After the spliced pole inserted the mounting hole, joint shell 16 was located 17 circumference edges of recess and inlays in ring channel 69, formed spacing cooperation, avoided the knob to take place the axial at the rotation process and beat, improved the connection stability between knob and the shell, and then guaranteed to carry out the operation validity who adjusts through the knob.

The main control panel 2 is also provided with a contact 24 for adjusting the temperature of hot air discharged by the hot air gun and a temperature display screen 25 for displaying the temperature, and the shell 1 is provided with a key 81 matched with the contact and a cover 82 covering the outside of the temperature display screen. The rear side of the top shell 13 is provided with a mounting hole 136 matched with the temperature display screen 25, a key hole 137 for mounting the key 81 and a through groove 138 for extending the shifting block 64 out of the shell in sequence. Set up the button on the shell, the user can pass through the hot-blast temperature of button regulation hot-blast rifle according to the work needs, improves hot-blast rifle's commonality. The main control panel is also provided with a display screen for displaying relevant temperature parameters, so that a user can know the working condition of the hot air gun conveniently, and the universality of the hot air gun is further improved.

In this embodiment, the main control board 2 is fixedly connected to the inner wall of the top housing 13 by screws, the main control board is provided with two contacts 24, one is used for increasing the hot air temperature, the other is used for decreasing the hot air temperature, correspondingly, two keys 81 are provided, and a deformable connecting rib is arranged between the two keys. Correspondingly, two limiting holes 83 for the keys 81 to pass through are formed in the cover 82.

As shown in fig. 9, the temperature detection device 4 includes a detection circuit board 41 electrically connected to the main control board 2 and an infrared detection head 42 provided on the detection circuit board. The front end of the shell 1 is fixed with a hot air pipe 18, a heating component 36 is arranged in the hot air pipe, and a temperature detection device is arranged behind the heating component.

The heating assembly 36 includes a bracket 361 and a heating wire wound on the bracket, and the hot air device 3 further includes an inner bracket 33, an outer seat 34 and a positioning ring 35. The fan 31 is disposed behind the heat generating component 36, and the motor 32 is disposed behind the fan. The inner support 33 is arranged outside the motor and the fan, the rear end of the inner support is fixedly sleeved outside the motor 32, and the fan 31 is rotatably arranged inside the front end of the inner support. The outer support 34 is fixed in the containing cavity of the outer shell 1 and is arranged outside the inner support, the rear end of the outer support is fixedly connected with the inner support, the front end of the outer support is connected with the rear end part of the hot air pipe 18 through a positioning ring 35, and the rear end part of the support is inserted in the positioning ring.

In this embodiment, a sleeve 331 matching with the motor 32 is disposed at the rear end of the inner bracket 33, the rear end of the inner bracket is fixed to the outside of the motor through the cooperation of the sleeve and the motor, and the fan 31 is rotatably disposed inside the front end of the inner bracket. The rear end of the outer support 34 is provided with a clamping groove 341, the outer wall of the inner support 33 is provided with a clamping block 332 matched with the clamping groove, and the rear end of the outer support is fixedly connected to the inner support through the matching of the clamping groove and the clamping block. The outer support 34 is connected to the top case 13 through a buckle structure, a fastening protrusion 342 is provided on the outer wall of the outer support, a protrusion 139 is provided on the inner wall of the top case, a fastening groove 139a matched with the fastening protrusion is provided on the protrusion, and the outer support is fixed in the accommodating cavity of the outer shell 1 through the matching of the fastening protrusion and the fastening groove. In order to better fix the outer support, a plurality of supporting ribs for limiting the outer support are arranged on the inner wall of the left shell and the inner wall of the right shell.

The positioning ring 35 is fixed at the front end of the outer base 34 by screws, the rear end face of the positioning ring is provided with a plurality of convex connecting convex columns 351, the connecting convex columns are provided with threaded holes matched with the screws, the periphery of the front end of the outer base is provided with concave holes 343 into which the connecting convex columns are inserted, the bottom wall of the concave holes is provided with connecting holes through which the screws pass, and the screws pass through the connecting holes from the rear end of the outer base and then are screwed in the threaded holes on the connecting convex columns. In order to realize the installation and positioning between the outer seat and the positioning ring, a plurality of protruding positioning columns 344 are arranged on the circumference of the front end surface of the outer seat 34, and positioning holes 352 for the positioning columns to insert are arranged on the circumference of the positioning ring 35.

The rear end of the hot-blast pipe 18 is provided with an integrally formed positioning ring 181, the positioning ring is evenly provided with a plurality of clamping holes 182 along the circumferential direction, the front end face of the positioning ring 35 is provided with buckles 353 which are in one-to-one correspondence with the clamping holes along the circumferential direction, and the rear end of the hot-blast pipe is connected to the positioning ring through the matching of the clamping holes and the buckles. The outer wall of the rear end of the support 361 is provided with a plurality of limiting ribs 362, the inner wall of the positioning ring 35 is provided with a limiting groove 354 for inserting the limiting ribs, and the support is in limiting connection with the positioning ring through the matching of the limiting ribs and the limiting groove.

In this embodiment, the detection circuit board 41 is fixed in the outer base 34 by screws, and the screws for connecting the outer base and the positioning ring simultaneously penetrate through the detection circuit board, so as to fix the detection circuit board. A gap is formed between the detection circuit board and the inner wall of the outer support, so that the blowing air flow formed by the rotation of the fan can be smoothly blown to the heating component, and the hot air flow is formed.

The support 361 is hollow, a hollow communication pipe 37 is arranged inside the support, a detection channel 38 is formed by a hollow inner cavity of the communication pipe, the detection circuit board 41 is arranged behind the communication pipe, and the infrared detection head 42 is positioned in an axial projection plane of the detection channel.

In this embodiment, the front end of the hot air duct 18 is provided with a positioning bracket 183, the front end of the communication tube 37 abuts against the positioning bracket 183, the rear end of the communication tube abuts against the detection circuit board 41, and the infrared detection head 42 is located in the detection channel 38. Further, the axial center of the hot air duct 18, the axial center of the holder 361, and the axial center of the communication pipe 37 are overlapped. In order to improve the stability of the hot air pipe 18, the front end of the shell 1 is also provided with a machine head sleeve 19 matched with the hot air pipe, the machine head sleeve is fixed at the front end of the shell through clamping and matching, and the hot air pipe penetrates through the machine head sleeve.

When the heating device is used, the power supply is switched on through the main switch 15, and the target temperature of the heated object is adjusted through the key 81. When the knob 6 is rotated, the slider 7 drives the knob post 22 to move on the control module 21, so as to adjust the rotating speed of the motor 32, and thus, the aim of adjusting the wind power discharged by the hot air gun is achieved. After the machine body is started, the heating wire works, the motor 32 drives the fan 31 to rotate, and air heated by the heating wire is continuously discharged through the hot air pipe 18 to form hot air flow. The front end of the hot air pipe is aligned with the heated object, and the heated object is heated by the hot air flow.

When the heat gun is operated, infrared radiation energy generated by the heated object enters the detection channel 38 and is received by the infrared detection head 42, so that the heating temperature of the heated object is measured. The temperature detection device transmits the measured heating temperature to the main control panel 2, and the target temperature and the measured heating temperature are displayed on the temperature display screen 25 at the same time. The main control board compares the measured heating temperature with a set target temperature, and controls the indication state of the indicator lamp 52 through the control substrate 51 when the measured heating temperature is higher or lower than the target temperature. Specifically, when the measured heating temperature is higher than the target temperature, the indicator lights are sequentially turned on from the front to the rear, and the user is instructed to move the heat gun away from the object to be heated. When the measured temperature is lower than the target temperature, the indicator lamps are sequentially lightened from back to front to indicate the user to make the hot air gun approach to the heated object.

The heat gun provided by the embodiment is additionally provided with the temperature detection device and the heating indicating device, so that the proper distance between the heat gun and the heated object can be kept, the heated object is in a proper heated state, the potential safety hazard caused by the fact that the heated object is melted or catches fire due to the fact that the heating temperature is unknown or uncontrollable is avoided, the heating effect is ensured, and meanwhile, the use safety is improved. The heating indicating device reminds the user of paying attention to the operation through the indicating lamp, the indication is obvious, and the user is effectively reminded of paying attention to the heating indicating device. The purpose of shifting is achieved by adopting a rotating mode to replace a linear mode and a key mode, the required occupied installation space and operation space are smaller, the overall structure of the hot air gun can be more compact, and the machine body is convenient to hold and use.

It is understood that the bracket in this embodiment may be a ceramic bracket, and may also be a mica sheet bracket.

It is understood that the top case in the present embodiment may be integrated with the left case or the right case.

It is understood that the effective identification distance of the infrared detection head in this embodiment should be greater than the length of the detection channel.

It is understood that the fixing plate in this embodiment may also be fixed in the housing by other fixing means, such as riveting, gluing, etc.

It can be understood that, when the heat gun of the present embodiment is used, the heating temperature of the heating component and/or the rotation speed of the motor can be adjusted before heating, and the heating temperature of the heating component and/or the rotation speed of the motor can also be adjusted during heating.

The front end of each part refers to one end of each part which is closer to a heated object when the heat gun is used, and the rear end of each part refers to one end and one end of each part which is farther away from the heated object when the heat gun is used.

Example two

The second embodiment of the present invention is different from the first embodiment in that the main control board 2 is further provided with a capacitor. After the power supply of the air heater is cut off, the capacitor can supply power to the main control board 2 and the heating indicating device 5 for a short time. When the air heater just cut off the power supply, the residual temperature of the heating component 36 is higher, and when the residual temperature of the heating component exceeds a certain range, the main control panel 2 instructs the indicator lamp 52 to flash to remind the user of paying attention, so that the user is prevented from being burnt by the residual temperature of the heating component or the potential safety hazard of the air heater is prevented from being placed at will, and the use safety is improved.

EXAMPLE III

The third embodiment of the present invention is different from the first embodiment in that a laser head for positioning the detection position of the temperature detection device is further disposed on the detection circuit board 41. The specific position of the heated object can be accurately positioned and detected through the laser head, and the accuracy of the temperature detection device in detection is further ensured, so that the heating effect of the hot air gun on the heated object is better ensured.

Example four

The fourth embodiment of the present invention is different from the first embodiment in that a reflective layer is disposed on the inner wall of the detection channel 38, and specifically, the reflective layer is a reflective coating. The infrared radiation energy generated by the heated object after being heated can be transmitted to the infrared detection head through the reflective layer, so that the infrared detection head can receive more effective infrared radiation energy, the detection accuracy of the temperature detection device is further improved, and the working reliability of the hot air gun is ensured. The reflector layer is for coating in the reflective coating of monitoring channel inner wall, and the infrared detection head of both being convenient for receives outside infrared radiation energy, makes things convenient for the processing of reflector layer again, only through the coating can, processing is simple, easily realizes.

EXAMPLE five

The difference between the fifth embodiment of the present invention and the first embodiment of the present invention is that the hollow inner space of the bracket 361 directly forms the detection channel, and the arrangement of the communication pipe is omitted, so that the structure can well meet the detection requirement.

In order to improve the detection accuracy, a reflective layer can be arranged on the inner wall of the detection channel, and the reflective layer can be a reflective coating layer or aluminum foil paper or fluorescent paper or electro-optical paper coated on the inner wall of the detection channel.

Other embodiments of the present invention than the preferred embodiments described above, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, should fall within the scope of the present invention defined in the claims.

Claims

1. The hot air gun comprises a shell, wherein a main control panel and a hot air device are arranged in the shell, the hot air device comprises a heating component, a fan and a motor for driving the fan to rotate, a hot air pipe for discharging hot air is arranged at the front end of the shell, the heating component is arranged in the hot air pipe, and the heating component and the motor are both electrically connected with the main control panel; the temperature detection device comprises a detection circuit board electrically connected with the main control board and an infrared detection head arranged on the detection circuit board, and a detection channel for the infrared detection head to receive external infrared radiation energy is arranged on the heating component; the heating indicating device comprises a control substrate and an indicating lamp, wherein the control substrate is electrically connected with the main control panel; the heating assembly comprises a hollow bracket and a heating wire wound on the bracket, an insulating and heat-insulating communicating pipe is arranged in the bracket, the detection channel is arranged on the communicating pipe, and the infrared detection head is positioned in an axial projection plane of the detection channel; the plurality of indicator lamps are uniformly arranged at intervals along the length direction of the control substrate, and the shell is provided with a plurality of jacks matched with the indicator lamps; when the measured temperature of the heated object is higher than a preset value, the indicator lamps are sequentially lightened from the front to the back; when the measured temperature of the heated object is lower than a preset value, the indicator lamps are sequentially lightened from back to front.

2. The heat gun according to claim 1, wherein a capacitor is provided on the main control board.

3. The heat gun according to claim 1, wherein the detection circuit board is provided with a laser head for positioning a detection position of the temperature detection device, and the laser head is located in an axial projection plane of the detection channel.

4. The heat gun according to claim 1, wherein the main control board is provided with a control module for controlling the motor, the control module is provided with a button post, the housing is rotatably provided with a knob connected to the button post, and the knob is rotated to drive the button post to move on the control module to adjust the rotation speed of the motor.

5. The heat gun according to claim 4, wherein the control module has a slider, the slider has a slot for inserting the button, and the button is connected to the slider.

6. The heat gun according to claim 5, wherein the slider has a protrusion on a side facing away from the control module, the knob has a driving hole for inserting the protrusion, and the knob is connected to the slider through the driving hole and the protrusion.

7. The hot air gun according to any one of claims 1 to 6, wherein the hot air device further comprises an inner bracket for connecting the fan to the motor and an outer bracket disposed outside the inner bracket, the outer bracket is disposed behind the hot air pipe, a positioning ring for connection is disposed between the outer bracket and the hot air pipe, a plurality of fasteners are uniformly disposed at a front end of the positioning ring along the circumferential direction, a positioning ring is disposed at a rear end of the hot air pipe, fastening holes matched with the fasteners are uniformly disposed at the positioning ring along the circumferential direction, and a rear end of the hot air pipe is connected to the positioning ring through the fastening holes and the fasteners.

8. The hot air gun according to claim 7, wherein the outer wall of the inner bracket is provided with a plurality of clamping blocks, the rear end of the outer holder is provided with clamping grooves matched with the clamping blocks, and the rear end of the outer holder is connected to the inner bracket through the matching of the clamping grooves and the clamping blocks; the outer wall of the outer support is provided with a clamping protrusion, the inner wall of the shell is provided with a clamping groove matched with the clamping protrusion, and the outer support is connected to the shell through the matching of the clamping protrusion and the clamping groove.